Defence Secretary Michael Fallon visits HMS Vigilant, one of the UK's four nuclear warhead-carrying submarines at Royal Navy’s Faslane nuclear base on the Clyde.

The boat was first launched on 11 October 1995, and was later named at Barrow by Her Majesty the Queen in February 1998.

Since then, she has been deployed on various Royal Navy missions - including reducing stranded military personnel after the air travel disruption after the 2010 Eyjafjallajökull eruption.

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HMS Ocean was launched in October 1995

And in 2002, the ship sparked a diplomatic incident when she accidentally landed on the San Felipe beach in the Spanish town of La Linea instead of Gibraltar, as various media outlets labelled the mistake as an "invasion"

But in November 2015, the Ministry of Defence confirmed HMS Ocean is to be decommissioned in 2018 - despite recently undergoing a £65million refit - as part of cost saving measures with no like-for-like replacement.

Under the 2015 Strategic Defence Review, one of two 65,000-ton Queen Elizabeth-class carriers would instead be “enhanced” to support Royal Marine amphibious operations.